How to let others add photos to your shared Photo Streams

iCloud Photo Sharing lets you easily share photos with other iPhone and iPad owners in what's called a shared Photo Stream. Once you create the stream and they join it, they can view, comment, and like any photos you add. And, if you like, you can even let other people add photos to your shared Photo Stream. It's great for family and friends, for vacations, and for sharing pictures of the kids.